rtc: s5m: support different register layout

Prepare for adding support for S2MPS14 RTC device to the
rtc-s5m driver:

1. Add a map of registers used by the driver which differ between
   the chipsets (S5M876X and S2MPS14).

2. Move code of checking for alarm pending to separate function.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Sangbeom Kim <sbkim73@samsung.com>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/drivers/rtc/rtc-s5m.c b/drivers/rtc/rtc-s5m.c
index 3751ef90f93c01ff584491e00f207f5e8fe709a2..59860128a221672a2c8c278af8ebdd57a523a2d5 100644 (file)
--- a/drivers/rtc/rtc-s5m.c
+++ b/drivers/rtc/rtc-s5m.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013 Samsung Electronics Co., Ltd
+ * Copyright (c) 2013-2014 Samsung Electronics Co., Ltd
  *     http://www.samsung.com
  *
  *  Copyright (C) 2013 Google, Inc
@@ -38,6 +38,42 @@
  */
 #define UDR_READ_RETRY_CNT     5
 
+/* Registers used by the driver which are different between chipsets. */
+struct s5m_rtc_reg_config {
+       /* Number of registers used for setting time/alarm0/alarm1 */
+       unsigned int regs_count;
+       /* First register for time, seconds */
+       unsigned int time;
+       /* RTC control register */
+       unsigned int ctrl;
+       /* First register for alarm 0, seconds */
+       unsigned int alarm0;
+       /* First register for alarm 1, seconds */
+       unsigned int alarm1;
+       /* SMPL/WTSR register */
+       unsigned int smpl_wtsr;
+       /*
+        * Register for update flag (UDR). Typically setting UDR field to 1
+        * will enable update of time or alarm register. Then it will be
+        * auto-cleared after successful update.
+        */
+       unsigned int rtc_udr_update;
+       /* Mask for UDR field in 'rtc_udr_update' register */
+       unsigned int rtc_udr_mask;
+};
+
+/* Register map for S5M8763 and S5M8767 */
+static const struct s5m_rtc_reg_config s5m_rtc_regs = {
+       .regs_count             = 8,
+       .time                   = S5M_RTC_SEC,
+       .ctrl                   = S5M_ALARM1_CONF,
+       .alarm0                 = S5M_ALARM0_SEC,
+       .alarm1                 = S5M_ALARM1_SEC,
+       .smpl_wtsr              = S5M_WTSR_SMPL_CNTL,
+       .rtc_udr_update         = S5M_RTC_UDR_CON,
+       .rtc_udr_mask           = S5M_RTC_UDR_MASK,
+};
+
 struct s5m_rtc_info {
        struct device *dev;
        struct i2c_client *i2c;
@@ -48,6 +84,7 @@ struct s5m_rtc_info {
        int device_type;
        int rtc_24hr_mode;
        bool wtsr_smpl;
+       const struct s5m_rtc_reg_config *regs;
 };
 
 static const struct regmap_config s5m_rtc_regmap_config = {
@@ -119,8 +156,9 @@ static inline int s5m8767_wait_for_udr_update(struct s5m_rtc_info *info)
        unsigned int data;
 
        do {
-               ret = regmap_read(info->regmap, S5M_RTC_UDR_CON, &data);
-       } while (--retry && (data & S5M_RTC_UDR_MASK) && !ret);
+               ret = regmap_read(info->regmap, info->regs->rtc_udr_update,
+                               &data);
+       } while (--retry && (data & info->regs->rtc_udr_mask) && !ret);
 
        if (!retry)
                dev_err(info->dev, "waiting for UDR update, reached max number of retries\n");
@@ -128,21 +166,47 @@ static inline int s5m8767_wait_for_udr_update(struct s5m_rtc_info *info)
        return ret;
 }
 
+static inline int s5m_check_peding_alarm_interrupt(struct s5m_rtc_info *info,
+               struct rtc_wkalrm *alarm)
+{
+       int ret;
+       unsigned int val;
+
+       switch (info->device_type) {
+       case S5M8767X:
+       case S5M8763X:
+               ret = regmap_read(info->regmap, S5M_RTC_STATUS, &val);
+               val &= S5M_ALARM0_STATUS;
+               break;
+       default:
+               return -EINVAL;
+       }
+       if (ret < 0)
+               return ret;
+
+       if (val)
+               alarm->pending = 1;
+       else
+               alarm->pending = 0;
+
+       return 0;
+}
+
 static inline int s5m8767_rtc_set_time_reg(struct s5m_rtc_info *info)
 {
        int ret;
        unsigned int data;
 
-       ret = regmap_read(info->regmap, S5M_RTC_UDR_CON, &data);
+       ret = regmap_read(info->regmap, info->regs->rtc_udr_update, &data);
        if (ret < 0) {
                dev_err(info->dev, "failed to read update reg(%d)\n", ret);
                return ret;
        }
 
        data |= S5M_RTC_TIME_EN_MASK;
-       data |= S5M_RTC_UDR_MASK;
+       data |= info->regs->rtc_udr_mask;
 
-       ret = regmap_write(info->regmap, S5M_RTC_UDR_CON, data);
+       ret = regmap_write(info->regmap, info->regs->rtc_udr_update, data);
        if (ret < 0) {
                dev_err(info->dev, "failed to write update reg(%d)\n", ret);
                return ret;
@@ -158,7 +222,7 @@ static inline int s5m8767_rtc_set_alarm_reg(struct s5m_rtc_info *info)
        int ret;
        unsigned int data;
 
-       ret = regmap_read(info->regmap, S5M_RTC_UDR_CON, &data);
+       ret = regmap_read(info->regmap, info->regs->rtc_udr_update, &data);
        if (ret < 0) {
                dev_err(info->dev, "%s: fail to read update reg(%d)\n",
                        __func__, ret);
@@ -166,9 +230,9 @@ static inline int s5m8767_rtc_set_alarm_reg(struct s5m_rtc_info *info)
        }
 
        data &= ~S5M_RTC_TIME_EN_MASK;
-       data |= S5M_RTC_UDR_MASK;
+       data |= info->regs->rtc_udr_mask;
 
-       ret = regmap_write(info->regmap, S5M_RTC_UDR_CON, data);
+       ret = regmap_write(info->regmap, info->regs->rtc_udr_update, data);
        if (ret < 0) {
                dev_err(info->dev, "%s: fail to write update reg(%d)\n",
                        __func__, ret);
@@ -215,10 +279,11 @@ static void s5m8763_tm_to_data(struct rtc_time *tm, u8 *data)
 static int s5m_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
        struct s5m_rtc_info *info = dev_get_drvdata(dev);
-       u8 data[8];
+       u8 data[info->regs->regs_count];
        int ret;
 
-       ret = regmap_bulk_read(info->regmap, S5M_RTC_SEC, data, 8);
+       ret = regmap_bulk_read(info->regmap, info->regs->time, data,
+                       info->regs->regs_count);
        if (ret < 0)
                return ret;
 
@@ -245,7 +310,7 @@ static int s5m_rtc_read_time(struct device *dev, struct rtc_time *tm)
 static int s5m_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
        struct s5m_rtc_info *info = dev_get_drvdata(dev);
-       u8 data[8];
+       u8 data[info->regs->regs_count];
        int ret = 0;
 
        switch (info->device_type) {
@@ -266,7 +331,8 @@ static int s5m_rtc_set_time(struct device *dev, struct rtc_time *tm)
                1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday,
                tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
 
-       ret = regmap_raw_write(info->regmap, S5M_RTC_SEC, data, 8);
+       ret = regmap_raw_write(info->regmap, info->regs->time, data,
+                       info->regs->regs_count);
        if (ret < 0)
                return ret;
 
@@ -278,11 +344,12 @@ static int s5m_rtc_set_time(struct device *dev, struct rtc_time *tm)
 static int s5m_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
        struct s5m_rtc_info *info = dev_get_drvdata(dev);
-       u8 data[8];
+       u8 data[info->regs->regs_count];
        unsigned int val;
        int ret, i;
 
-       ret = regmap_bulk_read(info->regmap, S5M_ALARM0_SEC, data, 8);
+       ret = regmap_bulk_read(info->regmap, info->regs->alarm0, data,
+                       info->regs->regs_count);
        if (ret < 0)
                return ret;
 
@@ -294,54 +361,42 @@ static int s5m_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
                        return ret;
 
                alrm->enabled = !!val;
-
-               ret = regmap_read(info->regmap, S5M_RTC_STATUS, &val);
-               if (ret < 0)
-                       return ret;
-
                break;
 
        case S5M8767X:
                s5m8767_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);
-               dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
-                       1900 + alrm->time.tm_year, 1 + alrm->time.tm_mon,
-                       alrm->time.tm_mday, alrm->time.tm_hour,
-                       alrm->time.tm_min, alrm->time.tm_sec,
-                       alrm->time.tm_wday);
-
                alrm->enabled = 0;
-               for (i = 0; i < 7; i++) {
+               for (i = 0; i < info->regs->regs_count; i++) {
                        if (data[i] & ALARM_ENABLE_MASK) {
                                alrm->enabled = 1;
                                break;
                        }
                }
-
-               alrm->pending = 0;
-               ret = regmap_read(info->regmap, S5M_RTC_STATUS, &val);
-               if (ret < 0)
-                       return ret;
                break;
 
        default:
                return -EINVAL;
        }
 
-       if (val & S5M_ALARM0_STATUS)
-               alrm->pending = 1;
-       else
-               alrm->pending = 0;
+       dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
+               1900 + alrm->time.tm_year, 1 + alrm->time.tm_mon,
+               alrm->time.tm_mday, alrm->time.tm_hour,
+               alrm->time.tm_min, alrm->time.tm_sec,
+               alrm->time.tm_wday);
+
+       ret = s5m_check_peding_alarm_interrupt(info, alrm);
 
        return 0;
 }
 
 static int s5m_rtc_stop_alarm(struct s5m_rtc_info *info)
 {
-       u8 data[8];
+       u8 data[info->regs->regs_count];
        int ret, i;
        struct rtc_time tm;
 
-       ret = regmap_bulk_read(info->regmap, S5M_ALARM0_SEC, data, 8);
+       ret = regmap_bulk_read(info->regmap, info->regs->alarm0, data,
+                       info->regs->regs_count);
        if (ret < 0)
                return ret;
 
@@ -356,10 +411,11 @@ static int s5m_rtc_stop_alarm(struct s5m_rtc_info *info)
                break;
 
        case S5M8767X:
-               for (i = 0; i < 7; i++)
+               for (i = 0; i < info->regs->regs_count; i++)
                        data[i] &= ~ALARM_ENABLE_MASK;
 
-               ret = regmap_raw_write(info->regmap, S5M_ALARM0_SEC, data, 8);
+               ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
+                               info->regs->regs_count);
                if (ret < 0)
                        return ret;
 
@@ -377,11 +433,12 @@ static int s5m_rtc_stop_alarm(struct s5m_rtc_info *info)
 static int s5m_rtc_start_alarm(struct s5m_rtc_info *info)
 {
        int ret;
-       u8 data[8];
+       u8 data[info->regs->regs_count];
        u8 alarm0_conf;
        struct rtc_time tm;
 
-       ret = regmap_bulk_read(info->regmap, S5M_ALARM0_SEC, data, 8);
+       ret = regmap_bulk_read(info->regmap, info->regs->alarm0, data,
+                       info->regs->regs_count);
        if (ret < 0)
                return ret;
 
@@ -408,7 +465,8 @@ static int s5m_rtc_start_alarm(struct s5m_rtc_info *info)
                if (data[RTC_YEAR1] & 0x7f)
                        data[RTC_YEAR1] |= ALARM_ENABLE_MASK;
 
-               ret = regmap_raw_write(info->regmap, S5M_ALARM0_SEC, data, 8);
+               ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
+                               info->regs->regs_count);
                if (ret < 0)
                        return ret;
                ret = s5m8767_rtc_set_alarm_reg(info);
@@ -425,7 +483,7 @@ static int s5m_rtc_start_alarm(struct s5m_rtc_info *info)
 static int s5m_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
        struct s5m_rtc_info *info = dev_get_drvdata(dev);
-       u8 data[8];
+       u8 data[info->regs->regs_count];
        int ret;
 
        switch (info->device_type) {
@@ -450,7 +508,8 @@ static int s5m_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
        if (ret < 0)
                return ret;
 
-       ret = regmap_raw_write(info->regmap, S5M_ALARM0_SEC, data, 8);
+       ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
+                       info->regs->regs_count);
        if (ret < 0)
                return ret;
 
@@ -495,7 +554,7 @@ static const struct rtc_class_ops s5m_rtc_ops = {
 static void s5m_rtc_enable_wtsr(struct s5m_rtc_info *info, bool enable)
 {
        int ret;
-       ret = regmap_update_bits(info->regmap, S5M_WTSR_SMPL_CNTL,
+       ret = regmap_update_bits(info->regmap, info->regs->smpl_wtsr,
                                 WTSR_ENABLE_MASK,
                                 enable ? WTSR_ENABLE_MASK : 0);
        if (ret < 0)
@@ -506,7 +565,7 @@ static void s5m_rtc_enable_wtsr(struct s5m_rtc_info *info, bool enable)
 static void s5m_rtc_enable_smpl(struct s5m_rtc_info *info, bool enable)
 {
        int ret;
-       ret = regmap_update_bits(info->regmap, S5M_WTSR_SMPL_CNTL,
+       ret = regmap_update_bits(info->regmap, info->regs->smpl_wtsr,
                                 SMPL_ENABLE_MASK,
                                 enable ? SMPL_ENABLE_MASK : 0);
        if (ret < 0)
@@ -564,9 +623,11 @@ static int s5m_rtc_probe(struct platform_device *pdev)
                break;
        case S5M8763X:
                regmap_cfg = &s5m_rtc_regmap_config;
+               info->regs = &s5m_rtc_regs;
                break;
        case S5M8767X:
                regmap_cfg = &s5m_rtc_regmap_config;
+               info->regs = &s5m_rtc_regs;
                break;
        default:
                dev_err(&pdev->dev, "Device type is not supported by RTC driver\n");
@@ -653,7 +714,7 @@ static void s5m_rtc_shutdown(struct platform_device *pdev)
        if (info->wtsr_smpl) {
                for (i = 0; i < 3; i++) {
                        s5m_rtc_enable_wtsr(info, false);
-                       regmap_read(info->regmap, S5M_WTSR_SMPL_CNTL, &val);
+                       regmap_read(info->regmap, info->regs->smpl_wtsr, &val);
                        pr_debug("%s: WTSR_SMPL reg(0x%02x)\n", __func__, val);
                        if (val & WTSR_ENABLE_MASK)
                                pr_emerg("%s: fail to disable WTSR\n",